It is possible that the main title of the report Marfan Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
As Jenny points out, being able to lisp the alphabet song at age two has little to do with 'knowing' the alphabet. And, yes, most children learn the letters by sight and sound in kindergarten, although most are capable of learning this information sooner if diligently taught by parents or others.
Speech. Children start identifying the sounds around them from the earliest age. They may say their first word as early as 6-months old or as late as a year and a half. By the time a child is two years old she may have a vocabulary of 100 words.peech. Children start identifying the sounds around them from the earliest age. They may say their first word as early as 6-months old or as late as a year and a half. By the time a child is two years old she may have a vocabulary of 100 words.